Cat Water Fountain Filters, Compatible with Stainless Steel Pet Fountain 12 Filters with 12 Sponges Replacement FiltersCat Water Fountain FiltersCotton layer and activated carbon forming a three layer filtration system. They can filter hair,particle,heavy metals, and improve the taste of the drinking water. Good Applicability Compatible with 67 Oz 2L&102Oz 3. 2L stainless steel cat water fountain RecommendationsPlease soak the filter in water for 2 minutes and rinse it thoroughly under running water before use and change the filter every 2 4 weeks. What You Get12 cat